There's a missing new in NativeWebSocketClient.cs which prevents it from compiling:
https://github.com/Unity-Technologies/multiplayer-community-contributions/blame/5cea8f048cc16f3575fabcf03af3ebafbc390499/Transports/com.community.netcode.transport.websocket/Runtime/NativeWebSocketClient.cs#L58
Results in
Library/PackageCache/com.community.netcode.transport.websocket@5a5c9ac2f2d8/Runtime/NativeWebSocketClient.cs(58,27): error CS1955: Non-invocable member 'InvalidOperationException' cannot be used like a method.
There's a missing
newin NativeWebSocketClient.cs which prevents it from compiling:https://github.com/Unity-Technologies/multiplayer-community-contributions/blame/5cea8f048cc16f3575fabcf03af3ebafbc390499/Transports/com.community.netcode.transport.websocket/Runtime/NativeWebSocketClient.cs#L58
Results in
Library/PackageCache/com.community.netcode.transport.websocket@5a5c9ac2f2d8/Runtime/NativeWebSocketClient.cs(58,27): error CS1955: Non-invocable member 'InvalidOperationException' cannot be used like a method.